Creating a JTabbedPane with scroll tabs works via constructor creation but the button thumbs fail to traverse the tabs when the property is called directly via setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT).

Attached sample.
Steps:

1. Compile sample
2. Run sample
3. Click the button, the TabPane will convert to scrolls
4. Try to click the right arrow to move tabs
Observe: Nothing happens, same test with the TabPane created in constructor works, i.e.
tabPane = new JTabbedPane(JTabbedPane.TOP, JTabbedPane.SCROLL_TAB_LAYOUT);